Penning

[Paper] The ASACUSA CUSP: an antihydrogen experiment

The ASACUSA CUSP: an anti hydrogen experiment

N. Kuroda et al.

In order to test CPT symmetry between antihydrogen and its counterpart hydrogen, the ASACUSA collaboration plans to perform high precision microwave spectroscopy of ground-state hyperfine splitting of antihydrogen atom in-flight. We have developed an apparatus (“cusp trap”) which consists of a superconducting anti-Helmholtz coil and multiple ring electrodes. For the preparation of slow antiprotons and positrons, Penning-Malmberg type traps were utilized. The spectrometer line was positioned downstream of the cusp trap. At the end of the beamline, an antihydrogen beam detector was located, which comprises an inorganic Bismuth Germanium Oxide (BGO) single-crystal scintillator housed in a vacuum duct and surrounding plastic scintillators. A significant fraction of antihydrogen atoms flowing out the cusp trap were detected.

Nov 10, 2015 by Theo experiment 0

[paper] Demonstration of the double Penning Trap technique with a single proton

Demonstration of the double Penning Trap technique with a single proton

A. Mooser et al.

doi: 10.1016/j.physletb.2013.05.012

Spin flips of a single proton were driven in a Penning trap with a homogeneous magnetic field.
For the spin-state analysis the proton was transported into a second Penning trap with
a superimposed magnetic bottle, and the continuous Stern–Gerlach effect was applied.
This first demonstration of the double Penning trap technique with a single proton suggests
that the antiproton magnetic moment measurement can potentially be improved by three
orders of magnitude or more.

Jun 4, 2013 by Theo experiment 0

[paper] Direct Measurement of the Proton Magnetic Moment

Direct Measurement of the Proton Magnetic Moment

J. DiSciacca and G. Gabrielse

doi: 10.1103/PhysRevLett.108.153001

The proton magnetic moment in nuclear magnetons is measured to be μ_p/μ_N≡g/2=2.792 846±0.000 007, a 2.5 parts per million uncertainty. The direct determination, using a single proton in a Penning trap, demonstrates the first method that should work as well with an antiproton (p̅ ) as with a proton (p). This opens the way to measuring the p̅ magnetic moment (whose uncertainty has essentially not been reduced for 20 years) at least 103 times more precisely.

Apr 10, 2012 by Theo g factor 0

[paper] g Factor of Hydrogenlike ²⁸Si¹³⁺

g Factor of Hydrogenlike ²⁸Si¹³⁺

S. Sturm et al.

doi: 10.1103/PhysRevLett.107.023002

We determined the experimental value of the g factor of the electron bound in hydrogenlike ²⁸Si¹³⁺ by using a single ion confined in a cylindrical Penning trap. From the ratio of the ion’s cyclotron frequency and the induced spin flip frequency, we obtain g=1.995 348 958 7(5)(3)(8). It is in excellent agreement with the state-of-the-art theoretical value of 1.995 348 958 0(17), which includes QED contributions up to the two-loop level of the order of (Zα)2 and (Zα)4 and represents a stringent test of bound-state quantum electrodynamics calculations.

Jul 7, 2011 by Theo experiment g factor 0

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